Phase behavior of the carbon dioxide/toluene/poly(methyl methacrylate) ternary system

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL Fluid Phase Equilibria Pub Date : 2024-05-31 DOI:10.1016/j.fluid.2024.114153

Hiroaki Matsukawa , Takumi Tachibana , Ryota Suzuki , Katsuto Otake

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Abstract

Carbon dioxide/organic polymer/solvent systems have several industrial applications, including supercritical polymerization. Various process parameters affect the phase behavior of these systems, thereby influencing the process design. Accordingly, the phase behavior of a carbon dioxide (CO₂)/toluene (Tol)/poly(methyl methacrylate) (PMMA) ternary system was investigated in this study. Measurements were performed using a synthetic method combined with laser displacement and turbidity measurement. Bubble points (vapor–liquid phase separation) were determined from changes in the piston displacement, whereas cloud points (liquid–liquid (LL) phase separation) were determined from changes in the turbidity The phase boundaries of CO₂ mass fractions ranging from 0.098 to 0.577 were measured by varying the Tol/PMMA ratio. The homogeneous phase area decreased when the ratio of PMMA to Tol increased, molecular weight of PMMA increased, and/or temperature decreased. These changes in the LL phase separation behavior were explained with reference to the free volume (v_f) and solubility parameter (δ) estimated using the Sanchez–Lacombe equation of state. The estimation of v_f and δ is expected to be helpful in comprehensively understanding the phase diagram and in predicting the phase behavior of CO₂/organic solvent/polymer systems.

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二氧化碳/甲苯/聚（甲基丙烯酸甲酯）三元体系的相行为

二氧化碳/有机聚合物/溶剂体系有多种工业应用，包括超临界聚合。各种工艺参数会影响这些体系的相行为，从而影响工艺设计。因此，本研究调查了二氧化碳（CO2）/甲苯（Tol）/聚甲基丙烯酸甲酯（PMMA）三元体系的相行为。测量采用合成法结合激光位移和浊度测量法进行。根据活塞位移的变化确定气泡点（汽液相分离），而根据浊度的变化确定浊点（液液（LL）相分离）。当 PMMA 与 Tol 的比例增加、PMMA 的分子量增加和/或温度降低时，均相面积减小。LL 相分离行为的这些变化可通过使用 Sanchez-Lacombe 状态方程估算的自由体积（vf）和溶解度参数（δ）来解释。预计 vf 和 δ 的估算有助于全面理解相图和预测 CO2/有机溶剂/聚合物体系的相行为。

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.